Lighting

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CAN (ON): Cucumber grower continues through winter with LED interlighting

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Submitted by Elsewhere on 2020-Dec-02 Wed 13:23

Albuna Farms has chosen to install Philips GreenPower LED interlighting to grow lights in its greenhouse in Ruthven, Ontario. During the first phase of the project, Philips GreenPower LED interlighting grow lights will be installed on 4.7 hectares in their greenhouse. Albuna Farms expects the new system…

📄 The Comparison of Constant and Dynamic Red and Blue Light Irradiation Effects on Red and Green Leaf Lettuce

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Submitted by Elsewhere on 2020-Nov-16 Mon 19:27

In this study, we sought to evaluate and compare the effects of constant and dynamic lighting on red and green leaf lettuce (Lactuca sativa L. Red Cos and Lobjoits Green cos) cultivated in a controlled environment. Plants were illuminated with the combination of red 662 and 638 nm, blue 452 nm, and far-red 737 nm at 16 h photoperiod and constant daily light integral (DLI) of each component. Five constant or dynamic lighting treatments were performed: (BR) constant flux of both B452 and R662; (B*R) constant flux of R662, but the DLI of B452 condensed in 8 h in the middle of photoperiod doubling the PPFD of blue light; (BR*) constant flux of B452, but the DLI of R662 light condensed in the middle of photoperiod; (BdynR) constant flux of R662, but the flux of B452 varies in the sinusoidal profile during 16 h photoperiod, imitating diurnal increase and decrease in lighting intensity; and (BRdyn) constant flux of B452, but the flux of R662 varies in sinusoidal profile. The lettuce’s response to dynamic lighting strategies was cultivar specific. Dynamic lighting strategies, mimicking natural lighting fluctuations, did not have a remarkable effect on photosynthesis and antioxidative parameters, but the dynamic flux of blue light component had a pronounced effect on higher macro and microelement contents in lettuce leaves.

The importance of light controllability for plant growth

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Submitted by Elsewhere on 2020-Nov-10 Tue 12:26

One of the most critical challenges—whether for greenhouse managers or for horticulture aficionados—is to provide plants with enough photoperiodic sunlight for effective photosynthesis, so that they can grow optimally regardless of the geographical location and climate. Winter months even in supposedly…

Screens: Leave the truss alone!

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Submitted by Elsewhere on 2020-Nov-05 Thu 10:10

In relatively hot climates like most of Australia, using an automated Shade or Energy Screen is an indispensable tool, but it is also a compromise – it’s really good at cooling the greenhouse, or really good at keeping it warm, but it can’t do both very well. So, Growers are increasingly opting for Double Screens – one screen…

Arthropods and greenhouse lighting: Like moths to a flame

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Submitted by Elsewhere on 2020-Nov-04 Wed 19:21

It is well-known that artificial lights can significantly improve crop production. Despite this, little research to date has examined how new light environments impact greenhouse crop protection – both the good bugs and the bad. We know that light impacts arthropods (insects and mites), such as when mayflies are drawn to streetlights, and moths to flames. But how important is it really to greenhouse pest management?

📄 Responses of cucumber seedlings to supplemental LED light

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Submitted by Elsewhere on 2020-Nov-03 Tue 07:37

In order to inhibit spindling growth and improve quality of cucumber seedlings under low irradiance, effects of supplemental light-emitting diodes (LED) light (SL) on morphological and physiological characteristics of cucumber seedlings at different growth stages under extremely low irradiance (ELI) were…

Kingsville approves bylaw against greenhouse light pollution

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Submitted by Elsewhere on 2020-Oct-27 Tue 08:59

The Town of Kingsville Council has passed a bylaw to crack down on greenhouse growers using lamps that produce a nighttime glow that can often be seen from dozens of kilometres away. According to a report from the town, several local greenhouse operations have site plan agreements that require "dark sky…

New OEM-agreement for shelf-and-lighting panels for vertical farming

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Submitted by Elsewhere on 2020-Oct-20 Tue 09:35

Senmatic and LED iBond International have entered a strategic partnership for OEM delivery of shelves with built-in grow light to be included in Senmatic’s offering of industrial vertical farming solutions. The new vertical farming shelves are based on LED iBond’s patented lighting fixture, which…

LED lighting helps Canadian vertical farm to increase food production all year round

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Submitted by Elsewhere on 2020-Oct-16 Fri 13:52

GoodLeaf Community Farms in Canada selected Signify to equip its new state-of-the-art farm with Philips Horticulture LED lighting. As a branded producer, GoodLeaf grows and packs fresh, nutritious, and pesticide-free micro and baby greens year-round. The company operates a 4,000-square-metre indoor vertical farm in Guelph, Ontario, which is now fully operational to supply some of the largest Canadian retail chains. GoodLeaf is backed by McCain Foods as its strategic investor.

Interpretation and evaluation of electrical lighting in plant factories

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Submitted by Elsewhere on 2020-Oct-15 Thu 12:44

In plant factories, light is fully controllable for crop production but involves a cost. For efficient lighting, light use efficiency (LUE) should be considered as part of light environment design.   The objectives of a new study were to evaluate and interpret the light interception, photosynthetic rate, and LUE…

The coupling of nanotechnology and luminescent films to optimize greenhouse light quality

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Submitted by Elsewhere on 2020-Oct-12 Mon 12:24

“UbiGro is essentially a layer of light in a greenhouse,” according to UbiQD’s chief of product, Matt Bergren, who enthusiastically described how the company’s UbiGro luminescent greenhouse film and its embedded nanotechnology facilitate light management in greenhouse settings. Based in New Mexico and established in 2014, UbiQD is harnessing nanotechnology for various applications, one of which is the optimization of greenhouse light quality through its UbiGro luminescent greenhouse gilms. UbiGro films use quantum dots to convert UV and blue photons to longer wavelengths, resulting in the emission of orange/red light. Otherwise stated, UbiGro is a photoluminescent film that glows when illuminated with sunlight due to the conversion of short wavelengths to long wavelengths. This allows growers to harness various wavelengths for photosynthesis and improve crop yields.

Light from top to bottom

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Submitted by Elsewhere on 2020-Oct-12 Mon 12:24

The use of high-tech greenhouse facilities and vertical farms for fruit and vegetable crop cultivation is skyrocketing in certain parts of the globe as a response to increased demand for fresh produce, less reliable weather conditions and the rising scarcity of cultivable farmland. Precision farming ensures all-year production, higher yields, improvement in product quality and higher marketable value. Modern indoor farming technologies offer the possibility to boost plant density as compared with open field cultivation. However, failing to provide adequate lighting at the necessary points in a dense canopy is bound to result in suboptimal crop yields. For instance, using more toplight modules will only lead to a bigger electricity bill while the lower parts of the plants will still not receive the proper amount of light.

Impact of UV-C radiation on disease sensitivity and fruit quality of strawberry

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Submitted by Elsewhere on 2020-Oct-08 Thu 11:03

Ultraviolet-C (UV-C) radiation is efficient in reducing the development of diseases in many species, including strawberry (Fragaria × ananassa). Several studies suggest that UV-C radiation is effective not only because of its disinfecting effect but also because it may stimulate plant defenses. In a new…

See how Pao Tau Enterprises retrofitted their greenhouses with P.L. Light Systems NXT-LP luminaires

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Submitted by Elsewhere on 2020-Oct-05 Mon 13:37

See how Pao Tau Enterprises retrofitted their greenhouses with P.L. Light Systems NXT-LP luminaires helping them to achieve greater light uniformity and efficiency while improving overall plant growth! pllight.com/projects/pao-t…

Bringing year-round local supply to Canada by lighting up greenhouses

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Submitted by Elsewhere on 2020-Sep-29 Tue 09:41

Red Sun Farms, a North American greenhouse grower with locations in Canada, USA, and Mexico, are embracing technology by lighting up a high-tech greenhouse to bring a year-round supply from Canada. There are three distinct projects underway in support of year-round Ontario grown produce: First, a new state of…

End-Of-Day LED Lightings Influence the Leaf Color, Growth and Phytochemicals in Two Cultivars of Lettuce

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Submitted by Elsewhere on 2020-Sep-26 Sat 15:00

Four light treatments (W: white light; EOD-B: end-of-day enhanced blue light; EOD-FR: end-of-day supplementary far-red light; EOD-UV: end-of-day supplementary ultraviolet-A light) were designed to explore the effects of end-of-day (EOD) lightings (30 min before dark period) on leaf color, biomass and phytochemicals accumulation in two lettuce cultivars (Lactuca sativa cv. ‘Red butter’ and ‘Green butter’) in artificial light plant factory. EOD-FR stimulated the plant and shoot biomass of two cultivars, and EOD-B suppressed the growth of ‘Red butter’ but induced higher biomass in ‘Green butter’. EOD lightings generated brighter, greener and yellower leaf in ‘Red butter’ at harvest, but the highest lightness and the deepest redness of ‘Green butter’ leaf were observed in the middle growth stage. ‘Red butter’ had prominent higher contents of chlorophylls and carotenoids, while these pigments showed less sensitivity to the interaction of cultivars and EOD lightings. EOD lightings impeded the accumulation of anthocyanin in two cultivars, except EOD-UV slightly increased the anthocyanin contents in ‘Green butter’. EOD-UV strengthened the antioxidant capability of ‘Green butter’, but EOD lightings had different effects on the antioxidant and nutritional compound contents in two lettuce cultivars.

 

What's the difference between broad full spectrum LEDs and red/blue LEDs?

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Submitted by Elsewhere on 2020-Sep-23 Wed 13:18

Growers generally have two options when it comes to horticultural LED spectrums – “full spectrum or broad-spectrum, which appears as white light; and red/blue spectrum, which can appear as purple or pink light.    

The red/blue spectrum LED luminaires are often referred to as narrow band spectrum lights – because the wavelengths they emit are within a narrow band of light.   LED luminaires that emit a “white” light are often referred to as “broad spectrum” or “full spectrum” lights because they include a broad band of the light spectrum (more similar to the sun) which renders a “white” light (there are no true white wavelengths).   

It should be noted that essentially all “white” LEDs are blue LEDs that are coated in a phosphor that converts the blue light into longer wavelengths. The phosphor absorbs the blue light and re-emits some or most of the photons into green and red light.  This coating reduces the efficiency of the LED in converting photons into usable PAR (photosynthetically active radiation) light, but makes for a better work environment in sole source applications. The composition of the phosphor coating will help to determine the spectral quality of the white light emitted. To find the efficacy of your luminaire, you will need to divide the Photosynthetic Photon Flux (PPF) of the luminaireby its input wattage.  The resulting efficacy value, will be represented in μmol/J.  The higher the number, the more efficient the luminaire is at converting electrical energy into photons of PAR.   

Microbe–Plant Growing Media Interactions Modulate the Effectiveness of Bacterial Amendments on Lettuce Performance inside a Plant Factory with Artificial Lighting

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Submitted by Elsewhere on 2020-Sep-23 Wed 13:11

There is a need for plant growing media that can support a beneficial microbial root environment to ensure that optimal plant growth properties can be achieved. We investigated the effect of five rhizosphere bacterial community inocula (BCI S1–5) that were collected at three open field organic farms and two soilless farms on the performance of lettuce (Lactuca sativa L.). The lettuce plants were grown in ten different plant growing media (M1–10) composed of 60% v/v peat (black peat or white peat), 20% v/v other organics (coir pith or wood fiber), 10% v/v composted materials (composted bark or green waste compost) and 10% v/v inorganic materials (perlite or sand), and one commercial plant growing medium inside a plant factory with artificial lighting. Fractional factorial design of experiments analysis revealed that the bacterial community inoculum, plant growing medium composition, and their interaction determine plant performance. The impact of bacterial amendments on the plant phenotype relied on the bacterial source. For example, S3 treatment significantly increased lettuce shoot fresh weight (+57%), lettuce head area (+29%), root fresh weight (+53%), and NO3-content (+53%), while S1 treatment significantly increased lettuce shoot dry weight (+15%), total phenolic content (+65%), and decreased NO3-content (−67%). However, the effectiveness of S3 and S1 treatment depended on plant growing medium composition. Principal component analysis revealed that shoot fresh weight, lettuce head area, root fresh weight, and shoot dry weight were the dominant parameters contributing to the variation in the interactions. The dominant treatments were S3-M8, S1-M7, S2-M4, the commercial plant growing medium, S1-M2, and S3-M10. Proper selection of plant growing medium composition is critical for the efficacy of bacterial amendments and achieving optimal plant performance inside a plant factory with artificial lighting.

DesignLight Consortium released version 2.0 of Technical Requirements for Horticultural LED

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Submitted by Elsewhere on 2020-Sep-15 Tue 08:18

The DesignLights Consortium (DLC) today released the final version of its Technical Requirements for LED-based Horticultural Lighting: Version 2.0, an update that will continue the industry transition from traditional lighting data and metrics to horticultural-specific lighting data and metrics that best…

Tinted solar panels allow plants to grow efficiently on ‘agrivoltaic’ farms

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Submitted by Elsewhere on 2020-Sep-10 Thu 10:25

Tinted solar panels could allow land to be used to grow crops and generate electricity simultaneously, with financial gains, according to researchers in the UK and Italy. The orange solar panels absorb some wavelengths of light, while allowing those that are best for plant growth to pass through. The…

Comparison of costs in greenhouse cucumber with LED or HPS

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Submitted by Elsewhere on 2020-Sep-08 Tue 10:12

The amount of energy used in agricultural production, processing and distribution is constantly increasing. During the winter months in the greenhouse production industry, the supplemental lighting required to keep up production levels results in high expenditure. Current technology uses broadband…

Best types of grow lights for flower and bloom grow cycle

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Submitted by Elsewhere on 2020-Aug-18 Tue 10:03

When growing in a commercial greenhouse, all aspects need to be controlled and kept at the optimum levels for plants to grow and thrive. Anything less than optimal will lead to undue stress and will affect the overall quality and yields of crops. Proper lighting is one of the essential elements in a…

Exploring the impact of light on tomato plants and yield

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Submitted by Elsewhere on 2020-Aug-13 Thu 10:07

It's time for another Fluence research webinar, August 27 at 3 PM CEST, 8 AM CST. In this episode, Fluence experts from the Horticulture Service and Research teams will discuss two crucial experiments - conducted in collaboration with Wageningen University in the Netherlands - that improve our collective…